diff --git a/src/Proto.Actor/Deduplication/DeduplicationContext.cs b/src/Proto.Actor/Deduplication/DeduplicationContext.cs
index a6b87a1e8f..071035dbc8 100644
--- a/src/Proto.Actor/Deduplication/DeduplicationContext.cs
+++ b/src/Proto.Actor/Deduplication/DeduplicationContext.cs
@@ -110,7 +110,7 @@ private void CleanIfNeeded(long cutoff, long now)
             _cleanedAt = now;
             _oldest = 0;
         }
-        else if (_processed.Count >= 50 && _cleanedAt < _oldest)
+        else if (_processed.Count >= 50 && _cleanedAt <= _oldest)
         {
             var oldest = long.MaxValue;